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                              STAC ELECTRONICS
                         TECHNICAL SUPPORT BULLETIN

NUMBER:     018
SUBJECT:    WINDOW3.0

DATE:       September 18, 1991
TIME:       

SOURCE:         Tech Support, Engineering, User's Manual
SUPERCEDES/     TECH003 Dated 4/14/1991
SUPERCEDED BY:  
RELEASE STATUS: Public

TITLE:
    WINDOWS 3.0 in enhanced mode and STACKER

OVERVIEW:
    WINDOWS is a memory-intensive program.  It can be run in enhanced mode to
    take advantage of extended memory, and such operation is compatible with
    STACKER.

ISSUES/COMMENTS:
    1) When the XT/8 coprocessor board is present, its address range must be
       excluded in the WINDOWS SYSTEM.INI file.  Overlooking this step can
       lead to corruption of the Windows directory.  Omitting the EMMExclude
       can also lead to "Insufficient Memory" errors when launching Windows
       programs.
       Use of the AT/16 coprocessor presents no such problems.

    2) Permanent swap files cannot reside on the STACKER volume; (Windows
       does not present it as an option).

    3) Temporary swap files should also reside on the uncompressed drive.

    4) With third party (non-Microsoft) memory managers, certain files
       must exist in the identical directory paths on both the compressed
       Stacker drive and in the uncompressed boot drive.

            386MAX           BLUEMAX             QEMM386
            -----------      ------------        ------------
            386MAX.SYS       BLUEMAX.SYS         QEMM386.SYS
            386LOAD.SYS      385LOAD.SYS         LOADHI.SYS
            386MAX.VXD       BLUEMAX.VXD         WINHIRAM.VXD

RECOMMENDED ACTIONS:
    1) If WINDOWS is run in enhanced mode AND the XT/8 coprocessor board is
       installed, add an EMMExclude statement to WINDOWS\SYSTEM.INI under the
       heading [386ENH] (see User's Manual, "Microsoft Windows 3.0 in 386
       Enhanced Mode Users").  This should be done BEFORE WINDOWS is loaded,
 and can be accomplished using any text editor.  (If the coprocessor is
       disabled, SYSTEM.INI may be modified using NOTEPAD.)

2) If a permanent swap file will be part of the configuration, leave

       sufficient uncompressed space on the host volume.  If there is not 
 enough uncompressed space and you have Stacker version 2.0 or greater,
 use SDEFRAG to physically shrink the STACVOL file.
       If you are using version 1.12 or lower,the STACKER volume must be 
       SREMOVEd, and a smaller one created.

    3) Temporary swap files left on the uncompressed drive will not cause
       fragmentation in the STACKER volume.

    4) If the STACKER volume becomes corrupted or write-protected due to an
       interrupted 386-enhanced session:
        a) verify that STACKER coprocessor card address has been excluded in
           SYSTEM.INI;
        b) run SCHECK/F on the STACKER volume;
        c) delete the WIN386.SWP (temporary swap) file;
        d) run SCHECK/F again;
        e) reboot before writing anything to disk.